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Either can work.
I'm assuming the USB shoestring cable is the EQDIR.
The ST4 option allows PHD to send the guide commands to the guide camera through its USB port by setting the Mount to "On-camera" and the camera then passes them onto the mount through its ST4 port. If you also connect your mount it wont get guide commands through the EQDIR cable but it can tell PHD where its pointing if it is connected as an Aux Mount.
Alternatively, you can connect PHD directly to the mount through the EQDIR cable with Mount EQMOD ASCOM HEQ5/6 and send the guide commands through that cable. The camera then acts just as a camera so you don't need the ST4 cable.
Last edited by kens; 20-02-2016 at 11:43 PM.
Reason: clarification
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